/* Copyright (c) 2020 XEPIC Corporation Limited */
/*
 * Copyright (c) 2002-2010 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 * USA.
 */

#include <cassert>
#include <iostream>

#include "PExpr.h"
#include "config.h"
#include "netlist.h"
#include "util.h"

/*
 * The evaluate_attributes function evaluates the attribute
 * expressions from the map, and returns a table in a form suitable
 * for passing to netlist devices.
 */

attrib_list_t* evaluate_attributes(const map<perm_string, PExpr*>& att,
                                   unsigned& natt, Design* des,
                                   NetScope* scope) {
  natt = att.size();
  if (natt == 0) return 0;

  attrib_list_t* table = new attrib_list_t[natt];

  unsigned idx = 0;

  typedef map<perm_string, PExpr*>::const_iterator iter_t;
  for (iter_t cur = att.begin(); cur != att.end(); ++cur, idx += 1) {
    table[idx].key = (*cur).first;
    PExpr* exp = (*cur).second;

    /* If the attribute value is given in the source, then
       evaluate it as a constant. If the value is not
       given, then assume the value is 1. */
    verinum* tmp = 0;
    if (exp) {
      tmp = exp->eval_const(des, scope);
      if (tmp == 0) {
        cerr << exp->get_fileline() << ": error: ``" << *exp
             << "'' is not a constant expression." << endl;
        des->errors += 1;
      }
    }
    if (tmp == 0) tmp = new verinum(1);

    assert(tmp);

    table[idx].val = *tmp;
    delete tmp;
  }

  assert(idx == natt);
  return table;
}
